At night my ScanGuage matches the color of my speedo.

 

I have mine set to white, my GPS is green, the radio is amber - I'm so confuuuuuused!

 

I'm not sure if I need a pedantry alert tag for this, but: the manual says "87 or higher". That doesn't affect your main point.

The manual does warn against using lower than 87, saying it can cause severe knocking. If there were a significant benefit to be had from using higher than 87, you'd think they'd mention it, as they do with the 6-cylinder Tacoma. That's a great data point.

If any of the higher-octane advocates want to do some actual research and show a demonstrable benefit, I'd love to see it.

 

Once the people at Scangauge get the USB data cable out, I'll be very interested to run a few tanks of regular and premium while logging timing advance etc to put this to rest once and for all...

 

What nerdly ol' me would love to see is a way to record data from a ScanGauge and a GPS and plot the data on a map. I'd go nuts.

 

I meant the manual does not recommend any other than 87. Awhile ago I thought the "or higher" implied the higher the better, but now I think it just means it's OK to use higher. Had the manual not said "or higher", people might be thinking high octane is bad for the engine and be afraid to use it even if it was the only gas available.

 

Yeah - that's more or less what I was trying to say, but I didn't do a very good job of it.

less than 87 - bad. don't do it.
87 - recommended.
more than 87 - OK, but no benefit over 87.

 

Mine reads 12 at idle whether in Park/Neutral/or Drive.

 

My 5-speed reads 11 @ idle with a LOD of around 28 and it fluctuates between .1 and .2 GPH

 

If you get your engine running better it should stay at 0.1gph as long as you keep the fan off and don't move the steering wheel. RPM should be 640-650 unless you really got it loose form some highway driving them maybe 800rpm and still at 0.1gph. LOD is interesting at idle - gives you an idea as to how much power it takes to just sit and spin.

 

man, I GOTTA do this.

 

My TPS reads 11 at idle and 77 under hardest acceleration.

On my second fillup after getting the ScanGauge my adjustment factor was 11.1%, and now the odo matches the tank mileage (and my MPG has gone to hell!).

Someone in this thread said their speedo and odo were 8% too high. I've found the same. I will be calibrating on a longer drive soon. But damn, that's a lot to lose on the warranty--I'll be complaining at my next checkup.

This is the most addicting (best) toy I ever got for a car!

 

With the stock tires/wheels the speedo is optimistic (reads too high by up to 5%) and the odometer is the opposite (reads fewer miles than actually traveled by about 3%).

With tires of even a slightly different diameter, these numbers will change.

Currently, running a tire that is only 0.4 inch taller, my speedo is "right on" and my odo reads 6.1% less distance than I actually travel. That means in order to get an accurate MPG figure, I must multiply the mileage shown on the factory odometer by 1.06...

You have a number of things you need to do to calibrate your systems accurately: In a fairly long, straight run, set a trip odo to zero at a highway mile marker and at a mile marker at least 100 miles down the road, note the trip odo reading. Whip out your calculator and figure the correction. (For example, my trip odometer will read only 94.4 miles when I've traveled 100 actual miles.)

Comparing actual to indicated miles is where you have to start.

(This also means that in reality I will have rolled 38,196 actual miles before my warranty is over at 36,000 indicated.)

I suppose I really need to get one of these ScanGuage IIs - but so far every time I get ready to buy one, something else comes up. *sigh*

Tomas

 

I'm having fun with mine, I'll have to post some pics got it mounted in the cubby looks good (I like the dash clean) I need to borrow a GPS to check the speed my speedo is off cause of the tire size so same thing alot of the trip functions are going to be incorrect..

 

While a GPS is a lot more fun, you can always just use a stopwatch to calibrate the speedo, assuming you can hold a rock-steady speed while you're doing the timing. A cruise control and a nice flat road with light traffic are helpful.

 

The stop watch won't work because the odometer is off and the ScanGauge is a speed adjustment which once done also corrects the odometer. 3% higher on the speed adjustment in the SG will probably be correct if you run stock tires since that is a fixed digital error in the ECU. It will also increase the measured MPG reading in the SG and the fuel correction adjustment will probably reduce the measured MPG.
Neitsdelf - your fillup correction is maybe a little high at 11.1% I have mine at 9% the fillup is tricky because you can keep adding almost a gallon more gas to the tank after the first click on the filler nozzle so getting it really full takes about 3 minutes of one more clicks to get it to stop going down again in the filler spout.
Tomas - I let a friend borrow my SG1 and he already is getting better gas mileage in his tC after using it for one day. Ask Santa for one maybe! It add a new dimension to driving trying to get better gas mileage. I filled up today and then drove back 20 miles from Tiverton to Newport and managed 52.6mpg in my xB.

 

We're going to Knoxville (from SE Michigan) next week for Thanksgiving, so I plan on doing a bit of calibrating then. I think the manual for the gauge has some procedures for various calibrations.

Oh, and there will of course be chili in Cinci on the way!

 

My mileage has been consistently off by around 22% based on what the ScanGauge thinks it should be. Once I calibrated it after the first fillup it has been consistent.

 

Don't use the odometer; use mileposts on the freeway. (But yeah, a GPS is a lot more fun.)

 

One MUST have an external reference to calibrate with - one cannot use the odometer to calibrate the speedometer, etc. Find those mile markers or use a GPS.

Tomas